Interactions between H+band EMIC waves and radiation belt relativistic electrons: Comparisons of test particle simulations with quasi-linear calculations

2019 ◽  
Vol 26 (3) ◽  
pp. 032901 ◽  
Author(s):  
Song Fu ◽  
Binbin Ni ◽  
Xin Tao ◽  
Yasong Ge ◽  
Jiang Liu ◽  
...  
Keyword(s):  
Test Particle ◽  
Radiation Belt ◽  
Relativistic Electrons ◽  
Particle Simulations ◽  
Emic Waves

Test Particle Simulations of Interaction Between Monochromatic Chorus Waves and Radiation Belt Relativistic Electrons

2014 ◽  
Vol 351 (2) ◽  
pp. 427-434 ◽  
Author(s):  
Zhonglei Gao ◽  
Hui Zhu ◽  
Lewei Zhang ◽  
Qinghua Zhou ◽  
Chang Yang ◽  
...  
Keyword(s):  
Test Particle ◽  
Radiation Belt ◽  
Relativistic Electrons ◽  
Chorus Waves ◽  
Particle Simulations

scholarly journals Trapping and amplification of unguided mode EMIC waves in the radiation belt

2021 ◽  
Author(s):  
Geng Wang ◽  
Zhonglei Gao ◽  
Mingyu Wu ◽  
Guoqiang Wang ◽  
Sudong Xiao ◽  
...  
Keyword(s):  
Radiation Belt ◽  
Abundance Ratio ◽  
Relativistic Electrons ◽  
Scattering Loss ◽  
Propagation Behavior ◽  
Guided Mode ◽  
Waves Propagation ◽  
Spatial Locations ◽  
First Time ◽  
Emic Waves

Abstract Electromagnetic ion cyclotron (EMIC) waves can cause the scattering loss of the relativistic electrons in the earth's radiation belt. They can be classified into the guided mode and the unguided mode, according to waves propagation behavior. The guided mode waves have been widely investigated in the radiation belt, but the observation of the unguided mode waves have not been expected. Based on the observations of Van Allen Probes, we demonstrate for the first time the existence of the intense unguided mode EMIC waves. The reflection interface formed by the spatial locations of local helium cutoff frequencies can be nearly parallel to the equatorial plane when the proton abundance ratio decreases sharply with L-shell. This structure combined with the anisotropic hot protons can lead to the trapping and significant amplification of the unguided mode waves. These results may help to understand the nature of EMIC waves in the radiation belt.

scholarly journals The cusp: a window for particle exchange between the radiation belt and the solar wind

2006 ◽  
Vol 24 (11) ◽  
pp. 3131-3137 ◽  
Author(s):  
X.-Z. Zhou ◽  
T. A. Fritz ◽  
Q.-G. Zong ◽  
Z. Y. Pu ◽  
Y.-Q. Hao ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Open Field ◽  
Test Particle ◽  
Radiation Belt ◽  
Magnetospheric Convection ◽  
Cusp Region ◽  
Particle Simulations ◽  
Particle Exchange ◽  
Field Lines

Abstract. The study focuses on a single particle dynamics in the cusp region. The topology of the cusp region in terms of magnetic field iso-B contours has been studied using the Tsyganenko 96 model (T96) as an example, to show the importance of an off-equatorial minimum on particle trapping. We carry out test particle simulations to demonstrate the bounce and drift motion. The "cusp trapping limit" concept is introduced to reflect the particle motion in the high latitude magnetospheric region. The spatial distribution of the "cusp trapping limit" shows that only those particles with near 90° pitch-angles can be trapped and drift around the cusp. Those with smaller pitch angles may be partly trapped in the iso-B contours, however, they will eventually escape along one of the magnetic field lines. There exist both open field lines and closed ones within the same drift orbit, indicating two possible destinations of these particles: those particles being lost along open field lines will be connected to the surface of the magnetopause and the solar wind, while those along closed ones will enter the equatorial radiation belt. Thus, it is believed that the cusp region can provide a window for particle exchange between these two regions. Some of the factors, such as dipole tilt angle, magnetospheric convection, IMF and the Birkeland current system, may influence the cusp's trapping capability and therefore affect the particle exchanging mechanism. Their roles are examined by both the analysis of cusp magnetic topology and test particle simulations.

Corotating drift resonant electrons in Saturn's radiation belt: theory and observational evidence

2020 ◽  
Author(s):  
Yixin Hao ◽  
Yixin Sun ◽  
Elias Roussos ◽  
Ying Liu ◽  
Chongjing Yuan ◽  
...  
Keyword(s):  
Electric Field ◽  
Test Particle ◽  
Equatorial Plane ◽  
Radiation Belt ◽  
Observational Evidence ◽  
Diagnostic Feature ◽  
Electron Radiation ◽  
Radial Transport ◽  
Resonant Energy ◽  
Particle Simulations

<p>Corotating drift resonant (CDR) electrons, of which the gradient and curvature drift could cancel the corotation around the Saturn, could get efficiently radial transported when exposed to the Saturnian global convective electric field. Such fast radial transport could lead to significant adiabatic acceleration and therefore supply for the electron radiation belt population. In this work, the nonlinear trapping nature of the corotating drift resonance is investigated. Electrons trapped inside the resonant island preform a banana-like orbit in the equatorial plane. We present an estimation of the trapping limit in L shell and energy for the resonant electrons with varying first adiabatic invariant, which could be directly compared to CASSINI observations. The estimation of the trapping period also indicates that trapped electrons takes times of more hours to close their orbit than the traveling electrons. The evolution in energy spectrogram driven by Saturn's convection and corotation has also been predicted by our test particle simulations. We suggest  that the bifurcation of the 'zebra stripes' near the corotation drift resonant energy could be a diagnostic feature of the nonlinear CDR. Observations from MIMI/LEMMS with similar zebra stripes and the bifurcation have been found as predicted, proving that the electrons in Saturn's radiation belt are being transported radially by the convection and that corotating drift resonant could be a significant candidate for the plenishing of the Saturn's electron radiation belt.   </p>

scholarly journals Global MHD test particle simulations of >10 MeV radiation belt electrons during storm sudden commencement

2007 ◽  
Vol 112 (A9) ◽  
pp. n/a-n/a ◽  
Author(s):  
B. T. Kress ◽  
M. K. Hudson ◽  
M. D. Looper ◽  
J. Albert ◽  
J. G. Lyon ◽  
...  
Keyword(s):  
Test Particle ◽  
Radiation Belt ◽  
Sudden Commencement ◽  
Storm Sudden Commencement ◽  
Particle Simulations ◽  
Radiation Belt Electrons

Combined scattering loss of radiation belt relativistic electrons by simultaneous three-band EMIC waves: A case study

2016 ◽  
Vol 121 (5) ◽  
pp. 4446-4451 ◽  
Author(s):  
Fengming He ◽  
Xing Cao ◽  
Binbin Ni ◽  
Zheng Xiang ◽  
Chen Zhou ◽  
...  
Keyword(s):  
Radiation Belt ◽  
Relativistic Electrons ◽  
Scattering Loss ◽  
Emic Waves

scholarly journals Rapid Loss of Radiation Belt Relativistic Electrons by EMIC Waves

2017 ◽  
Vol 122 (10) ◽  
pp. 9880-9897 ◽  
Author(s):  
Zhenpeng Su ◽  
Zhonglei Gao ◽  
Huinan Zheng ◽  
Yuming Wang ◽  
Shui Wang ◽  
...  
Keyword(s):  
Radiation Belt ◽  
Relativistic Electrons ◽  
Rapid Loss ◽  
Emic Waves
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